Magnetoresistance Intensification of Fe3O4/BaTiO3 Nanoparticle-Composite-Sinter Produced by Low Temperature Heat Treatment

Magnetoresistance Intensification of Fe3O4/BaTiO3 Nanoparticle-Composite-Sinter Produced by Low Temperature Heat Treatment
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低温热处理制备 Fe3O4/BaTiO3 纳米粒子复合烧结体的磁阻强化

DOI:
10.1007/s10948-011-1271-9
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发表时间:
2011
期刊:
J. Supercon. Nov. Mag.
影响因子:
--
通讯作者:
清水哲夫
清水哲夫
中科院分区:
--
文献类型:
--
作者:
小堀裕己;氏本勝也;星野晃範;山崎篤志;杉村陽;谷口年史;堀江智之;内藤泰久;清水哲夫

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本文介绍了低温热处理制备的(Fe3O4)1−X/(BaTiO3)Xnanoparticle-composite-sinter(NPCS)磁阻增强效应的研究。α-Fe2O_3和BaTiO_3纳米粒子的平均尺寸分别为30 nm和40 nm。将它们均匀地混合在一起,在Ar(90%)/H2(10%)气氛中,在500 °C下烧结3小时。(Fe3O4)1−X/(BaTiO3)XNPCS的X在0到0.75之间变化。随着X的增加,材料的电阻率(ER)增大,并在较宽的温度范围内表现出Mott的变程跳跃(VRH)导电行为。在中等强磁场范围内,所有样品都观察到负微分磁阻(ND-MR)。在低磁场区域,磁流变表现出较大的磁滞回线。随着X的增大,MR的变化加剧。我们认为,电导的网络通道总数减少了,从而增强了自旋散射。
We have presented the study on the magnetoresistance intensification of (Fe3O4)1−X/(BaTiO3)Xnanoparticle-composite-sinter (NPCS) produced by low temperature heat treatment. The average sizes ofα-Fe2O3and BaTiO3nanoparticles are 30 nm and 40 nm, respectively. They were homogeneously mixed together and were sintered at 500 °C for 3 hours in the atmosphere of Ar(90%)/H2(10%).Xof (Fe3O4)1−X/(BaTiO3)XNPCS was varied between 0 and 0.75. With increasingX, the electrical resistivity (ER) increases and shows the Mott’s variable-range-hopping (VRH) conduction behavior in a wide temperature region. The negative differential magnetoresistivity (ND-MR) is observed for all samples in a moderately high magnetic field region. In a low magnetic field region, the MR shows a large hysteresis. AsXincreases, the variation of the MR is intensified. We consider that the total number of network channels of the electrical conduction is reduced and the spin scattering is consequently intensified.
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